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SMALL AREA PLOTTING SHEET. Prepared by Selçuk NAS. This presentation is required office XP. AIM UNDERSTANDING OF DRAWING A SMALL AREA PLOTTING SHEET Fixed or Selected Latitude Scale Fixed or Selected L ongitude Scale. Prepared by Selçuk NAS. REQUIRED PRIOR KNOWLEDGE AND SKILLS

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slide1

SMALL AREA PLOTTING SHEET

Prepared by Selçuk NAS

This presentation is required office XP

slide2

AIM

  • UNDERSTANDING OF DRAWING A SMALL AREA PLOTTING SHEET
  • Fixed or Selected LatitudeScale
  • Fixed or Selected LongitudeScale

Prepared by Selçuk NAS

REQUIRED PRIOR KNOWLEDGE AND SKILLS

World Coordinate System

Projection Systems and Mercator Projection

Charts and Chart’s Scales

Positioning Skill

REQUIRED TOOLS AND OTHER AIDS

Exercise Papers (A3)

Ruler - Divider - Protractor

slide3

600 N

Appx. Daily Steaming Distance

300 N

0900W

0600W

0300W

0000

slide4

Plotting sheets are used primarily when land, visual aids to navigation,

and depth of water are not important.

Small Area Plotting Sheet is cover max 20 of differences of latitude

There are two alternative methods for constructing Small Area Plotting Sheet

Fixed or Selected LatitudeScale

Fixed or Selected LongitudeScale

slide5

370 00’

360 30’

360 30’

360 00’

0560 00’

0550 00’

0550 30’

0570 00’

1. Fixed or Selected LatitudeScale

10 of dlat = 12 cm

Desired Latitudes : 360 N – 370 N

Desired Longitudes : 0550 E – 0570 E

1 st step : Draw a horizontal line in the middle of the sheet to represent

the middle of latitudes

2 nd step : Draw a circle with a radius to 10 of dlat fromcentre of the mid-lat line

3 rd step : Draw horizontal lines tangent at the top and bottom of circle

to represent latitudes.

4 th step : Draw a vertical line through the centre of the circle to represent the middle of longitude.

Your Small Area Plotting Sheet Is Ready To Plot

Let’s Review The Steps

5 th step : Draw a line, through the centre of the circle, making an angle with

the horizontal and equal to the mid latitude.

6 th step : Draw a vertical line through the intersection point of the circle and the line with angle

7 th step : Draw vertical lines to represent other longitudes with the same

longitude scale

8 th step : Determine minutes scale on the latitude and the longitude scale

0560 30’

slide6

1. Fixed or Selected LatitudeScale

10 of dlat = 12 cm

Desired Latitudes : 360 N – 370 N

Desired Longitudes : 0550 E – 0570 E

1 st step : Draw a horizontal line in the middle of the sheet to represent

the middle of latitudes

2 nd step : Draw a circle with a radius to 10 of dlat fromcentre of the mid-lat line

3 rd step : Draw horizontal lines tangent at the top and bottom of the circle

to represent latitudes.

4 th step : Draw a vertical line through the centre of the circle to represent the middle of longitude.

5 th step : Draw a line, through the centre of the circle, making an angle with

the horizontal and equal to the mid latitude.

6 th step : Draw a vertical line through the intersection point of the circle and the line with angle

7 th step : Draw vertical lines to represent other longitudes with the same

longitude scale

8 th step : Determine minutes scale on the latitude and the longitude scale

slide7

2. Fixed or Selected LongitudeScale

310

290

300

300

1270

1260

1250

1280

1290

10 of dlong = 6 cmDesired Latitudes : 290 S – 310 S

Desired Longitudes : 1250W – 1290W

1 st step : Draw a vertical line in the middle of the sheet to represent

the middle of longitudes.

2 nd step : Draw vertical lines to represent other longitudes with the same

longitude scale.

B

3 rd step : Draw a horizontal line in the middle of the sheet to represent

the middle of latitudes.

4 th step : Through the intersection of the mid-lat and mid-long, draw a line making an angle with the horizontaland equal to the mid-lat.

A

Your Small Area Plotting Sheet Is Ready To Plot

Let’s Review The Steps

5 th step : The length between the intersection point A and the intersection

of B is a latitude scale.

6 th step : Draw additional parallel lines perpendicular to the mid-lat, distance is lenght of A-B

7 th step : Determine minutes scale on the latitude and the longitude scale

slide8

2. Fixed or Selected LongitudeScale

10 of dlong = 6 cmDesired Latitudes : 290 S – 310 S

Desired Longitudes : 1250W – 1290W

1 st step : Draw a vertical line in the middle of the sheet to represent

the middle of longitudes.

2 nd step : Draw vertical lines to represent other longitudes with the same

longitude scale.

3 rd step : Draw a horizontal line in the middle of the sheet to represent

the middle of latitudes.

4 th step : Through the intersection of the mid-lat and mid-long, draw a line making an angle with the horizontaland equal to the mid-lat.

5 th step : The length between the intersection point A and the intersection

of B is a latitude scale.

6 th step : Draw additional parallel lines perpendicular the mid-lat, distance is lenght of A-B

7 th step : Determine minutes scale on the latitude and the longitude scale

slide10

THIS PRESENTATION WAS PREPARED

BY SELÇUK NAS

E MAIL : snas@deu.edu.tr

Mobile Phone : 0 532 331 51 31

Phone : 0 90 232 278 22 30

Address : Dokuz Eylul Universitesi, Deniz İsletmeciligi ve Yonetimi Yuksekokulu, Kaynaklar Yerleskesi, Buca, Izmir, TURKEY

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